====================================================== WARNING: possible circular locking dependency detected 6.1.134-syzkaller #0 Not tainted ------------------------------------------------------ syz.3.518/6784 is trying to acquire lock: ffff0000d69e8148 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0x9c/0x124 mm/memory.c:5851 but task is already holding lock: ffff0000e1eb6840 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1102 [inline] ffff0000e1eb6840 (&ni->ni_lock/5){+.+.}-{3:3}, at: ntfs_fiemap+0xec/0x168 fs/ntfs3/file.c:1167 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ni->ni_lock/5){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 ni_lock fs/ntfs3/ntfs_fs.h:1102 [inline] attr_data_get_block+0x34c/0x1f58 fs/ntfs3/attrib.c:951 ntfs_get_block_vbo+0x394/0xc8c fs/ntfs3/inode.c:595 ntfs_get_block+0x84/0xc4 fs/ntfs3/inode.c:689 __block_write_full_page+0x2f8/0xef4 fs/buffer.c:1745 block_write_full_page+0x124/0x154 fs/buffer.c:-1 ntfs_writepage+0xec/0x11c fs/ntfs3/inode.c:875 writeout mm/migrate.c:888 [inline] fallback_migrate_folio mm/migrate.c:912 [inline] move_to_new_folio+0x624/0xc24 mm/migrate.c:961 __migrate_folio_move mm/migrate.c:1199 [inline] migrate_folio_move mm/migrate.c:1297 [inline] migrate_pages_batch mm/migrate.c:1639 [inline] migrate_pages+0x29f4/0x452c mm/migrate.c:1843 do_mbind mm/mempolicy.c:1334 [inline] kernel_mbind mm/mempolicy.c:1481 [inline] __do_sys_mbind mm/mempolicy.c:1558 [inline] __se_sys_mbind mm/mempolicy.c:1554 [inline] __arm64_sys_mbind+0x8fc/0xb40 mm/mempolicy.c:1554 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 __might_fault+0xc4/0x124 mm/memory.c:5852 _copy_to_user include/linux/uaccess.h:143 [inline] copy_to_user include/linux/uaccess.h:169 [inline] ni_fiemap+0x1158/0x1478 fs/ntfs3/frecord.c:2140 ntfs_fiemap+0x110/0x168 fs/ntfs3/file.c:1169 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x194c/0x26f8 fs/ioctl.c:810 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ni->ni_lock/5); lock(&mm->mmap_lock); lock(&ni->ni_lock/5); lock(&mm->mmap_lock); *** DEADLOCK *** 1 lock held by syz.3.518/6784: #0: ffff0000e1eb6840 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1102 [inline] #0: ffff0000e1eb6840 (&ni->ni_lock/5){+.+.}-{3:3}, at: ntfs_fiemap+0xec/0x168 fs/ntfs3/file.c:1167 stack backtrace: CPU: 1 PID: 6784 Comm: syz.3.518 Not tainted 6.1.134-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x105c lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 __might_fault+0xc4/0x124 mm/memory.c:5852 _copy_to_user include/linux/uaccess.h:143 [inline] copy_to_user include/linux/uaccess.h:169 [inline] ni_fiemap+0x1158/0x1478 fs/ntfs3/frecord.c:2140 ntfs_fiemap+0x110/0x168 fs/ntfs3/file.c:1169 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x194c/0x26f8 fs/ioctl.c:810 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585